Calculate arithmetic mean of the following frequency distribution: Class less than 10 1020 2030 3040 4050 5060
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Question:
Class | less than 10 | 10−20 | 20−30 | 30−40 | 40−50 | 50−60 | more than 60 |
Frequency | 5 | 12 | 18 | 22 | 6 | 4 | 3 |
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